用shell脚本自己一个秒级定时任务

#!/bin/bash
 
# 配置文件和日志文件路径
CONFIG_FILE="./tasks.conf"
LOG_FILE="./tasks.log"
PID_FILE="./scheduler.pid"
RELOAD_SIGNAL_FILE="./reload.signal"
 
# 初始化配置文件和信号文件
if [ ! -f "$CONFIG_FILE" ]; then
    touch "$CONFIG_FILE"
fi
if [ -f "$RELOAD_SIGNAL_FILE" ]; then
    rm -f "$RELOAD_SIGNAL_FILE"
fi
 
# 任务状态跟踪表
declare -A LAST_EXECUTION_TIMES
 
# 定时调度器
scheduler() {
    echo $$ > "$PID_FILE"
    echo "调度器启动，PID: $$"
 
    while true; do
        # 检查是否需要重新加载配置
        if [ -f "$RELOAD_SIGNAL_FILE" ]; then
            echo "$(date '+%Y-%m-%d %H:%M:%S') [INFO] 重新加载配置" >> "$LOG_FILE"
            LAST_EXECUTION_TIMES=()  # 清空上次执行记录
            rm -f "$RELOAD_SIGNAL_FILE"
        fi
 
        # 当前时间戳
        local current_time=$(date +%s)
 
        # 动态加载配置文件并执行任务
        while IFS="=" read -r task_name interval command; do
            [ -z "$task_name" ] || [ -z "$interval" ] || [ -z "$command" ] && continue
 
            # 获取上次执行时间，如果没有记录，默认为0
            local last_exec_time=${LAST_EXECUTION_TIMES[$task_name]:-0}
 
            # 判断是否到达执行间隔
            if (( current_time - last_exec_time >= interval )); then
                (   #安装任务名记录任务执行情况
                    local TASK_LOG_FILE="$task_name/$(date '+%Y-%m-%d').log"
                    if [ ! -d "$(dirname "$TASK_LOG_FILE")" ]; then
                        mkdir -p "$(dirname "$TASK_LOG_FILE")"
                    fi
                    echo "$(date +'%H:%M:%S')执行start" >> "$TASK_LOG_FILE"
                    eval "$command" >> "$TASK_LOG_FILE" 2>&1
                    echo "end" >> "$TASK_LOG_FILE"
                ) &
                LAST_EXECUTION_TIMES[$task_name]=$current_time  # 更新任务的最后执行时间
            fi
        done < "$CONFIG_FILE"
 
        # 等待 1 秒
        sleep 1
    done
}
 
# 停止调度器
stop_scheduler() {
    if [ -f "$PID_FILE" ]; then
        local pid
        pid=$(cat "$PID_FILE")
        kill "$pid" && rm -f "$PID_FILE"
        echo "调度器已停止"
    else
        echo "调度器未运行"
    fi
}
 
# 添加任务
add_task() {
    local task_name="$1"
    local interval="$2"
    local command="$3"
    if grep -q "^$task_name=" "$CONFIG_FILE"; then
        echo "任务 '$task_name' 已存在"
        return 1
    fi
    echo "$task_name=$interval=$command" >> "$CONFIG_FILE"
    echo "任务 '$task_name' 添加成功"
}
 
# 删除任务
remove_task() {
    local task_name="$1"
    if ! grep -q "^$task_name=" "$CONFIG_FILE"; then
        echo "任务 '$task_name' 不存在"
        return 1
    fi
    sed -i "/^$task_name=/d" "$CONFIG_FILE"
    echo "任务 '$task_name' 已删除"
}
 
# 重新加载配置
reload_scheduler() {
    if [ ! -f "$PID_FILE" ]; then
        echo "调度器未运行，无法重新加载配置"
        return 1
    fi
    touch "$RELOAD_SIGNAL_FILE"
    echo "配置重新加载信号已发送"
}
 
# 显示帮助
show_help() {
    echo "用法: $0 [命令] [参数]"
    echo "命令:"
    echo "  start             启动调度器"
    echo "  stop              停止调度器"
    echo "  reload            重新加载配置文件"
    echo "  add 任务名 间隔秒数 命令  添加任务到配置文件"
    echo "  remove 任务名      从配置文件中删除任务"
    echo "  help              显示帮助"
}
 
# 主逻辑
case "$1" in
    start)
        scheduler
        ;;
    stop)
        stop_scheduler
        ;;
    reload)
        reload_scheduler
        ;;
    add)
        add_task "$2" "$3" "$4"
        ;;
    remove)
        remove_task "$2"
        ;;
    help|*)
        show_help
        ;;
esac

task1=5=echo '每5秒运行一次'
task2=30=date
task3=10=sleep 2 && echo '任务完成'

./scheduler.sh start

./scheduler.sh add "task1" 5 "echo 'Hello, every 5 seconds!'"

./scheduler.sh remove "task1"

./scheduler.sh reload

./scheduler.sh stop

sudo nano /etc/systemd/system/task-scheduler.service

[Unit]
Description=Task Scheduler Service
After=network.target
 
[Service]
Type=simple
User=root
ExecStart=/path/to/your/scheduler.sh start
ExecReload=/path/to/your/scheduler.sh reload
ExecStop=/path/to/your/scheduler.sh stop
WorkingDirectory=/path/to/working/directory
Restart=always
RestartSec=5
StandardOutput=journal
StandardError=journal
SyslogIdentifier=task-scheduler
 
[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload

sudo systemctl enable task-scheduler.service

sudo systemctl start task-scheduler.service

sudo systemctl status task-scheduler.service

sudo systemctl stop task-scheduler.service

sudo systemctl reload task-scheduler.service

sudo journalctl -u task-scheduler.service